Hair-spring stud for watches



(No Model.) I

W. OLDROYD & G. E. SMITH, Jr.

HAIR SPRING STUD FOR WATGHES.

Patented Feb. 2'7, 1883.

y), E P k\\\\ \\\\\\w MENTOR: i 4% L fijlyvwo BY ATTORNEYS.

UNITED STATES PATENT OFFICE.

WILLIAM OLDROYD, or COLUMBUS, AND enonen H. SMITH, 3a., or LAN- onsrnn, OHIO.

HAIR-SPRING STUD FOR WATCHES.

SPECIFICATION forming part of Letters Patent No. 273,138, dated February 27, 1883.

Application filed October 17, 1882. (No model.)

To all whom it may concern Be it known that we, WILLIAM OLDnoYD, of Columbus, in the county of Franklin and State of Ohio, and GEORGE H. SMITH, Jr., of

Lancaster, in the county of Fair-field and State of Ohio, have inventedcertain new and useful Improvements in Hair-Spring Studs for Vatches, of which the following is a full, clear, and exact description.

I0 111 lengthening or shortening the hairspring in watches or changing the amount thereof to be put in operation, it is customary to shift said spring at the end of its outer coil, and in doing this it becomes necessary to change or shift it at the other end also. This involves great particularity of adjustment and often requires much time and patience to put the watch in heat and so that the action of the spring is equal at both ends, and the removal of parts in order to efi'ect the adjustment at both ends of the spring consumes both time and labor.

The object of our improvement is to effect the necessary lengthening or shortening of the hair-spring and putting the watch in perfect .25 heat in a simple or rapid manner, and without detachment of parts or changing the collet at the center of the balance-wheel.

The invention consists primarily in the em ployment, in connection with the hair-spring,

0 of a regulating device to which the outer end of the spring is connected, and which is adjustable in a coincident plane with that of the outer coil of the spring; and, further, in certain other combinations and arrangements of 5 parts, substantially as hereinafter more fully set forth.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate 0 corresponding parts in all the figures.

Figure 1 represents an outside face view of the back or outer cap, in which the balance- Inovement works, showing also the balancewheel, hair-spring, and adjustable stud or de- 4 5 vice for the outer end of the spring, with means for regulating the same. Fig. 2 is a similar view with the outer cap removed, and Fig. 3 a transverse section on the line w 00 in Fig. 1. Fig. 4 is a plan view of the spring and adjust- 5o ing means for the outer end thereof under a modified construction of the same, to suit watches in which the hair-spring is arranged under the balance-wheel.

Referring, in the first instance, to F1gs. 1, 2,

, and 3 of the drawings, A is the balance-wheel 5 of a watch, B its hair-spring, and C the balance-staff, provided with theusual collet, Z1, and roller 0, with its attached jewel d, with which the lever of the watch engages.

D is the back or outer cap, in which the outer end of the balance-staff is centered, and E the plate below or on the opposite side ofthe hairspring.

The inner end of the hair-spring B is secured to the collet b of the balance-staff in the usual or any suitable manner; but the end portion of its outer coil, instead of being adjustable in or through a fixed stud, as heretofore, is adjustable, on slackening a pin or wedge, c, within or through a movable stud or curved holder, 0 G, which is adjustable on or across the cap 1) within a groove, f, therein by an indicator or handle, it, subject to retention when adjusted by a screw, 6, fitting through a slot, 7;, in said holder. By thus attaching or holding the outer coil of the hair-spring, said spring may be lengthened or shortened at will without removing the cap D, collet I), or other parts, by simply lengthening or adjusting the outer coil within or through its holder, and afterward 8o putting the watch in heat by moving the sliding or movable holder G backward or forward, as the case may require, thus dispensing with any changing or adjustment of the innerend of the spring.

The modification shown in Fig. at is to adapt the improvement to watches in which the hairspring is under the balance-wheel, in which case the sliding holder G is made adjustable on the plate E of the watch, and the indicator 0 h is dispensed with on the cap or bridge over the balance.

Havingthusfully described ourinventiomwe claim as new and desire to secure by Letters Pt1l36llt- 1. The combination, with the hair-spring of a watch, of the regulating device connected directly to the outer end of the spring, and adapted to act on the spring in the same plane with that of the outer coil of the spring, sub- :00 stantially as and for the purpose set forth.

2. The combination, with the hair-spring of a watch, of the regulating device, with the outer extremity of the spring connected thereto, said device being adjustable in a coincident curvature with that of the outer coil of the spring, substantially as and for the purpose set forth.

3. Thecombination, with the hair-spring of a Watch, of the regulating device, said spring bein connected to the said regulator to adapt it to be lengthened or shortened in the same plane with that of the outer coil of the spring, substantially as and for the purpose set forth.

4. The combinatian, with the hair-spring of a watch, of the regulating device segmental in form and having the outer end of the spring connected thereto, said regulator being adjustable in a coincident plane with that of the outer coil of the spring, and having an indicator, substantially as and for the purpose set 2o forth.

5. The combination, with the balance-wheel stalf, its collet, and the hair-spring, of the reg ulating device segmental in form and having the outer end of the spring connected thereto, said regulator being adjustable in a coincident plane with that of the outer coil of the spring, substantially as and for the purpose set forth.

6. The combination, with the hair-spring ot' a Watch, of the curved regulating device adapted to movein the arc of a circle, and provided with a curved slot and adjusting-screw, said regulator being connected to the outer end of the spring, substantially as and for the purpose set forth.

\VILLIAM OLDROYD. GEO. H. SMITH, JR.

Witnesses:

J. M. ELLIOTT, W. H. FrscHEL. 

